Weather on April 15
Simi Valley, CA
55 Years of Data
Avg High
70°F
Avg Low
50°F
Warmest
1999
75°F avg
Coldest
2009
47°F avg
About This Date
April 15th in Simi Valley, CA typically brings pleasant spring weather, with average highs around 70°F and lows near 50°F. Over 30 years of records, the warmest April 15th was in 1999 (75°F average), while the coldest was 2009 (47°F) — a 28°F range across recorded history. This date has historically been dry, with little recorded precipitation. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for April 15th in Simi Valley, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 65° | 46° | 55° | — | — |
| 2024 | 67° | 44° | 55° | — | — |
| 2023 | 75° | 49° | 62° | — | — |
| 2022 | 70° | 47° | 58° | — | — |
| 2021 | 72° | 45° | 58° | — | — |
| 2020 | 77° | 59° | 68° | — | — |
| 2019 | 72° | 47° | 59° | — | — |
| 2018 | 78° | 53° | 66° | — | — |
| 2017 | 81° | 54° | 67° | — | — |
| 2016 | 70° | 50° | 60° | — | — |
| 2015 | 77° | 57° | 67° | — | — |
| 2014 | 80° | 58° | 69° | — | — |
| 2013 | 62° | 46° | 54° | — | — |
| 2012 | 63° | 43° | 53° | — | — |
| 2011 | 84° | 61° | 72° | — | — |
| 2010 | 70° | 46° | 58° | — | — |
| 2009coldest | 57° | 37° | 47° | — | — |
| 2008 | 64° | 48° | 56° | — | — |
| 2007 | 61° | 45° | 53° | — | — |
| 2006 | 61° | 52° | 56° | — | — |
| 2005 | 79° | 59° | 69° | — | — |
| 2004 | 66° | 52° | 59° | — | — |
| 2003 | 61° | 43° | 52° | — | — |
| 2002 | 64° | 50° | 57° | — | — |
| 2001 | 71° | 49° | 60° | — | — |
| 2000 | 63° | 47° | 55° | — | — |
| 1999warmest | 81° | 69° | 75° | — | — |
| 1998 | 58° | 39° | 48° | — | — |
| 1997 | 85° | 56° | 70° | — | — |
| 1996 | 79° | 54° | 66° | — | — |
30 years of data from SIMI VALLEY CALIFORNIA